Cytotoxic T Cells How cytotoxic T cells get activated by MHC-I/antigen complexes and then proceed to kill infected cells. The instructor uses computer software for demonstration. The screen is dark with small writing, so the viewer may want to open the screen to 'full screen'. The instructor is clear and easy to understand.Author(s): No creator set

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Interurban Open Air Summer Car, Kokomo, Indiana Kokomo interurban lines ran open air cars in the summer, like this one destined for Highland Park. Taken from a scrapbook of businessman/inventor Brice Williams Sr., the postcard is one of several produced by Williams' own printing firm.,Howard County JourneyAuthor(s): Williams, Brice, Sr.

Wind Power from National Renewable Energy Laboratory This is a very informative video from The National Renewable Energy Laboratory (NREL) about wind power, how it works, the benefits, and its future. There is closed captioning, which is great because, for younger students, this will be paused throughout for explanations/discussions. Although this was made for adults, there is a very basic explanation of how wind mills turn the wind into energy. (06:45)Author(s): No creator set

Refraction in Gases This video explains how light travels through different materials to our eyes—or refraction. Refraction is the slowing down or bending of light as it moves through different transparent substances. This video explains the index of refraction, which is the speed of light in a vacuum divided by the speed of light in material. It provides a demonstration that shows how to create a mirage using a tank, fresh water, salt water, and a laser. (4:52)Author(s): No creator set

More control can be achieved in vapour deposition if a plasma is generated. A plasma is simply a gas where a proportion of the molecules have been ionised. The ions remain in an uneasy equilibrium with the electrons they have released, prevented from recombining only because the electrons are hot and fast-moving, and so are difficult to trap.

Plasmas are widely used in materials processing, with pressure ranging from 10−3 mbar to 1 mbar and typically up to 1% of the molecul

Johannesburg: an LBS student's view London Business School MBA students film their South African journey from their point of view as they help local entrepreneurs with the challenges they face as small businesses in an emerging market.Author(s): No creator set

Global Warming with Tim and Moby See how greenhouse gasses are suspected of causing Earth to heat up in this animated BrainPOP movie. A quiz is also included with this link. (Approximate run time 2:00)Author(s): No creator set

Lincoln's Grammar Book In this video clip, learn more about Abraham Lincoln and his devoted intense effort to self-education through reading. His grammar book survives as a testament to this self-made man's pursuit of knowledge. (2:25)Author(s): No creator set

Time-Lapse: Watch Flowers Bloom Before Your Eyes Witness dozens of different types of flowers unfurling in this stunning time-lapse video from filmmaker David de los Santos Gil. He used 5,000 out of 50,000 shots of his floral subjects for the final video, which was filmed over a period of nine months. (03:24)Author(s): No creator set